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I just upgraded my HT speakers from 7.2 to 9.2 Surround system by adding 2 Front Height Speakers.
I have set the speakers configuration at Denon AVR-4520CI to 9.2 speakers setting, and tested fine.
But in my HTPC control panel sound setting, I can only get the 7.2 system maximum, no 9.2 setting.
My HTPC running Windows 7 64bit with MSI R7850 Graphic Card.
Connections are all the way via HDMI.

On a second thought, if windows is getting the right EDID from your Denon AVR, I think it should be possible to set windows for 9.2 surround sound, unless there is a EDID bug or something... or maybe an HDMI limitation... IDK...

For 9.2 it is up to your receiver to process it correctly. You would just bitstream from the source material and the receiver will expand the 5.1 or 7.1 to 9.2. You'll need to read your receiver's manual to figure out the surround modes that support 9.2. I personally don't care much for the special formats and the only one I uses is to expand the TV stereo signals to Dolby PLx (or whatever it is called) to get 7.1.

You can't. As someone posted above, there's no discrete 9.2 (or even 9.1) format at the moment and the receiver more than likely does not accept 9.2 PCM, which is why it is not in the EDID and why Windows (which might be capable) won't output such a format to your receiver.

Instead you need to set it up for 7.1 and then engage PL-IIz or proprietary 9.2 encoding on your receiver, to get 9.2 audio produced.